private BranchParseNode BuildNode(bool success)
{
StackFrame removedFrame = PopFrame();
BranchParseNode result;
if (success)
{
LastOperation = Operation.Build;
result = new BranchParseNode(removedFrame.Rule, removedFrame.InputIndex, removedFrame.Nodes);
if (removedFrame.Rule is NamedRule named)
{
Super.ReportSuccess(named, result.MatchedText);
}
}
else
{
LastOperation = Operation.Cancel;
result = null;
if (removedFrame.Rule is NamedRule named)
{
Super.ReportFailure(named);
}
}
return(result);
}
internal static ISemanticNode FunctionCall(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode @ref = recurse(branch.GetDescendant(0));
BranchParseNode first = branch.GetDescendant(1, 0, 1, 0);
BranchParseNode fragments = branch.GetDescendant(1, 0, 1, 1);
if (first != null)
{
if (fragments != null)
{
ISemanticNode args = CompositeExpression(recurse(first), fragments, recurse);
return(new BranchSemanticNode((int)JsNodeType.FunctionCall, @ref, args));
}
else
{
return(new BranchSemanticNode((int)JsNodeType.FunctionCall, @ref, recurse(first)));
}
}
else
{
return(new BranchSemanticNode((int)JsNodeType.FunctionCall, @ref));
}
}
internal static ISemanticNode And(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var left = recurse(branch.GetDescendant(0));
var right = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.And, left, right));
}
internal static ISemanticNode PropertyAssignment(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode lvalue = recurse(branch.GetDescendant(0));
ISemanticNode rvalue = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.Assignment, lvalue, rvalue));
}
internal static ISemanticNode Identifier(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var text = branch.Leaf.MatchedText;
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)EbnfNodeType.Identifier, startIndex, text));
}
internal static ISemanticNode Token(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var name = recurse(branch.GetDescendant(0));
var expr = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)EbnfNodeType.Token, name.StartIndex, new[] { name, expr }));
}
internal static ISemanticNode Or(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode left = recurse(branch.GetDescendant(0));
ISemanticNode right = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)EbnfNodeType.Or, left, right));
}
internal static ISemanticNode CompositeExpression(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode first = recurse(branch.GetDescendant(0));
BranchParseNode fragments = branch.GetDescendant(1);
return(CompositeExpression(first, fragments, recurse));
}
internal static ISemanticNode Root(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var elements = branch.Elements;
var children = elements
.Select(recurse)
.ToArray();
return(new BranchSemanticNode((int)EbnfNodeType.Root, branch.StartIndex, children));
}
internal static ISemanticNode Regex(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\/", @"/");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)EbnfNodeType.Regex, startIndex, text));
}
internal static ISemanticNode Token(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
BranchParseNode identNode = branch.GetDescendant(0);
var ident = identNode.Leaf.MatchedText;
var startIndex = identNode.Leaf.StartIndex;
var name = new LeafSemanticNode((int)EbnfNodeType.Identifier, startIndex, ident);
ISemanticNode expr = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)EbnfNodeType.Token, name.StartIndex, new[] { name, expr }));
}
public override BranchParseNode ParseSyntax(string input)
{
IEnumerable <Lexeme> lexemes = Lex(input);
BranchParseNode result = ParseSyntax(lexemes);
if (result.MatchedText.Length != input.Length)
{
throw new Exception();
}
return(result);
}
public ISemanticNode Parse(string input)
{
if (!IsLocked)
{
throw new Exception();
}
BranchParseNode parseTree = ParseSyntax(input);
ISemanticNode semanticTree = ParseSemantics(parseTree);
return(semanticTree);
}
public void Ebnf()
{
var parserGen = new ParserGenerator();
var grammar = $@"
{RuleName.Equals} = ""="";
{RuleName.Pipe} = ""|"";
{RuleName.Asterisk} = ""*"";
{RuleName.QuestionMark} = ""?"";
{RuleName.ExclamationPoint} = ""!"";
{RuleName.Semicolon} = "";"";
{RuleName.LeftParenthesis} = ""("";
{RuleName.RightParenthesis} = "")"";
{RuleName.Whitespace} = /\s+/;
{RuleName.Identifier} = /\w(?:\w|\d)*/;
{RuleName.String} = /""(\\\\[^""]|\\\\""|[^""])*""/;
{RuleName.Regex} = /\/(\\\\[^\/]|\\\\\/|[^\/])+\//;
{RuleName.LineComment} = /\/\/[^{"\r\n"}]*(?=[{"\r\n"}])/;
{RuleName.And} = {RuleName.SimpleExpression} {RuleName.Expression};
{RuleName.Or} = {RuleName.SimpleExpression} {RuleName.Pipe} {RuleName.Expression};
{RuleName.Not} = {RuleName.ExclamationPoint} {RuleName.Expression};
{RuleName.Optional} = {RuleName.QuestionMark} {RuleName.Expression};
{RuleName.Repeat} = {RuleName.Asterisk} {RuleName.Expression};
{RuleName.Group} = {RuleName.LeftParenthesis} {RuleName.Expression} {RuleName.RightParenthesis};
{RuleName.Literal} = {RuleName.String} | {RuleName.Regex};
{RuleName.SimpleExpression} = {RuleName.Not} | {RuleName.Optional} | {RuleName.Repeat} | {RuleName.Group} | {RuleName.Identifier};
{RuleName.Expression} = {RuleName.Or} | {RuleName.And} | {RuleName.SimpleExpression};
{RuleName.Token} = {RuleName.Identifier} {RuleName.Equals} {RuleName.Literal} {RuleName.Semicolon};
{RuleName.Rule} = {RuleName.Identifier} {RuleName.Equals} {RuleName.Expression} {RuleName.Semicolon};
// This is a comment.
{RuleName.Root} = *({RuleName.Token} | {RuleName.Rule});
";
var settings = new ParserSettings
{
Algorithm = Parser.Algorithm.LL,
NestingType = Parser.NestingType.Recursion,
Unit = Parser.Unit.Lexeme,
};
Parser parser = parserGen.SpawnParser(settings, grammar, RuleName.Whitespace, RuleName.LineComment);
parser.Lock();
BranchParseNode result = parser.ParseSyntax(grammar);
Assert.AreEqual(grammar, result.MatchedText);
}
public ISemanticNode ParseSemantics(BranchParseNode node)
{
if (!IsLocked)
{
throw new Exception();
}
if (node.Rule is NamedRule named)
{
return(named.Action(node, ParseSemantics));
}
else
{
throw new Exception();
}
}
private static List <ISemanticNode> ExpressionFragments(BranchParseNode fragments, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode first = recurse(fragments.GetDescendant(0));
BranchParseNode restNode = fragments.GetDescendant(1);
if (restNode != null)
{
List <ISemanticNode> rest = ExpressionFragments(restNode, recurse);
return(new[] { first }.Concat(rest).ToList());
}
else
{
return(new[] { first }.ToList());
}
}
static ISemanticNode DefaultAction(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
if (branch.Rule is NamedRule rule)
{
throw new Exception($"No action specified for named rule: {rule.Name}");
}
branch = branch.Unwrap();
if (branch.Rule is NamedRule)
{
return(recurse(branch));
}
var children = branch.Elements
.Select(n =>
{
if (n.Rule is NamedRule)
{
return(recurse(n));
}
else
{
return(DefaultAction(n, recurse));
}
})
.Where(c => c != null)
.ToList();
if (children.Count == 1)
{
return(children[0]);
}
else
{
return(new BranchSemanticNode(0, branch.StartIndex, children));
}
}
internal static ISemanticNode Group(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse) => new BranchSemanticNode((int)EbnfNodeType.Group, recurse(branch.GetDescendant(1)));
internal static ISemanticNode LineComment(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
return(null);
}
internal static ISemanticNode Whitespace(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse) => null;
internal static ISemanticNode Constructor(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
ISemanticNode funCall = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.Constructor, funCall));
}
public CommandParser(Parameters parameters)
{
command = new Command("", parameters);
var grammar = $@"
equals = ""="";
shortOptions = /(?<= )-[_\w]+/;
shortOption = /(?<= )-[_\w]/;
longOption = /(?<= )--[_\w][-_\w]*/;
endOptions = /(?<= )--(?= )/;
doubleString = /""(?:\\\\""|\\\\[^""]|[^""\\\\])*""/;
singleString = /'(?:\\\\'|\\\\[^']|[^'\\\\])*'/;
identifier = /[_\w][-_\w]*/;
literal = /.+/;
ws = /\s+/;
path = /(([A-Za-z]:)?[\/\\\\])?[-_\\w.]+([\/\\\\][-_\\w.]+)*[\/\\\\]?/;
string = doubleString | singleString;
shortOptionWithValue = shortOption equals (identifier | string);
longOptionWithValue = longOption equals (identifier | string);
options = *(shortOptionWithValue | longOptionWithValue | shortOptions | longOption | identifier | string);
details = options ?(endOptions literal);
root = (string | path) ?details;
";
var parserGen = new ParserGenerator();
var settings = new ParserSettings
{
Algorithm = Algorithm.LL,
NestingType = NestingType.Stack,
Unit = Unit.Character,
};
parser = parserGen.SpawnParser(settings, grammar, "ws");
parser.AttachAction("shortOptions", (branch, recurse) =>
{
var startIndex = branch.Leaf.StartIndex;
IEnumerable <BranchSemanticNode> nodes = branch.Leaf.MatchedText
.Skip(1)
.Select((c, i) =>
{
return(new BranchSemanticNode((int)CommandNodeType.Argument,
new LeafSemanticNode((int)CommandNodeType.ShortOption, startIndex + 1 + i, c.ToString())));
});
return(new BranchSemanticNode((int)CommandNodeType.Arguments, startIndex, nodes));
});
parser.AttachAction("shortOption", (branch, recurse) =>
{
LeafParseNode nameNode = branch.Leaf;
var startIndex = nameNode.StartIndex;
var name = nameNode.MatchedText[1].ToString();
return(new BranchSemanticNode((int)CommandNodeType.Argument,
new LeafSemanticNode((int)CommandNodeType.ShortOption, startIndex, name)));
});
parser.AttachAction("shortOptionWithValue", (branch, recurse) =>
{
LeafParseNode nameNode = branch.GetDescendant(0).Leaf;
var startIndex = nameNode.StartIndex;
var name = nameNode.MatchedText[1].ToString();
ISemanticNode value = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)CommandNodeType.Argument,
new LeafSemanticNode((int)CommandNodeType.ShortOption, startIndex, name),
value));
});
parser.AttachAction("longOption", (branch, recurse) =>
{
LeafParseNode nameNode = branch.Leaf;
var startIndex = nameNode.StartIndex;
var name = nameNode.MatchedText.Substring(2);
return(new BranchSemanticNode((int)CommandNodeType.Argument,
new LeafSemanticNode((int)CommandNodeType.LongOption, startIndex, name)));
});
parser.AttachAction("longOptionWithValue", (branch, recurse) =>
{
LeafParseNode nameNode = branch.GetDescendant(0).Leaf;
var startIndex = nameNode.StartIndex;
var name = nameNode.MatchedText.Substring(2);
ISemanticNode value = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)CommandNodeType.Argument,
new LeafSemanticNode((int)CommandNodeType.LongOption, startIndex, name),
value));
});
parser.AttachAction("identifier", (branch, recurse) =>
{
LeafParseNode nameNode = branch.Leaf;
var startIndex = nameNode.StartIndex;
var name = nameNode.MatchedText;
return(new LeafSemanticNode((int)CommandNodeType.String, startIndex, name));
});
parser.AttachAction("doubleString", (branch, recurse) =>
{
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\""", @"""");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)CommandNodeType.String, startIndex, text));
});
parser.AttachAction("singleString", (branch, recurse) =>
{
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\'", @"'");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)CommandNodeType.String, startIndex, text));
});
parser.AttachAction("string", (branch, recurse) => recurse(branch.GetDescendant(0)));
parser.AttachAction("options", (branch, recurse) =>
{
IEnumerable <ISemanticNode> options = branch.GetDescendant(0)
?.Elements
?.Select(recurse);
return(new BranchSemanticNode((int)CommandNodeType.Options, branch.StartIndex, options ?? new ISemanticNode[0]));
});
parser.AttachAction("literal", (branch, recurse) =>
{
var value = branch.Leaf.MatchedText;
return(new LeafSemanticNode((int)CommandNodeType.String, branch.StartIndex, value));
});
parser.AttachAction("details", (branch, recurse) =>
{
BranchParseNode optionsNode = branch.GetDescendant(0);
BranchParseNode literalNode = branch.GetDescendant(1, 1);
var results = new List <ISemanticNode>();
if (optionsNode != null)
{
results.Add(recurse(optionsNode));
}
if (literalNode != null)
{
results.Add(recurse(literalNode));
}
return(new BranchSemanticNode((int)CommandNodeType.Details, branch.StartIndex, results));
});
parser.AttachAction("path", (branch, recurse) =>
{
var value = branch.MatchedText;
return(new LeafSemanticNode((int)CommandNodeType.String, branch.StartIndex, value));
});
parser.AttachAction("root", (branch, recurse) =>
{
ISemanticNode path = recurse(branch.GetDescendant(0));
ISemanticNode details = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)CommandNodeType.Root, path, details));
});
}
private static ISemanticNode CompositeExpression(ISemanticNode first, BranchParseNode fragments, Func <BranchParseNode, ISemanticNode> recurse)
{
List <ISemanticNode> rest = ExpressionFragments(fragments, recurse);
return(CompositeExpression(first, rest));
}
internal static ISemanticNode Unwrap(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse) => recurse(branch.GetDescendant(0));
internal static ISemanticNode Group(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var group = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.Group, group));
}
internal static ISemanticNode Not(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var not = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.Not, not));
}
internal static ISemanticNode Optional(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var opt = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.Optional, opt));
}
internal static ISemanticNode Repeat(BranchParseNode branch, Func <BranchParseNode, ISemanticNode> recurse)
{
var repeat = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)EbnfNodeType.Repeat, repeat));
}
public static Grammar GetGrammar()
{
var grammarString = $@"
varKeyword = /\b(var)\b/; // -/
letKeyword = /\b(let)\b/; // -/
newKeyword = /\b(new)\b/; // -/
deleteKeyword = /\b(delete)\b/; // X ?
instanceofKeyword = /\b(instanceof)\b/; // X ?
withKeyword = /\b(with)\b/; // X
voidKeyword = /\b(void)\b/; // X
typeofKeyword = /\b(typeof)\b/; // X ?
thisKeyword = /\b(this)\b/; // X ?
debuggerKeyword = /\b(debugger)\b/; // X
importKeyword = /\b(import)\b/; // X
classKeyword = /\b(class)\b/; // X
constKeyword = /\b(const)\b/; // X ?
extendsKeyword = /\b(extends)\b/; // X
yieldKeyword = /\b(yield)\b/; // X
superKeyword = /\b(super)\b/; // X
functionKeyword = /\b(function)\b/; // -/
tryKeyword = /\b(try)\b/; // X ?
catchKeyword = /\b(catch)\b/; // X ?
finallyKeyword = /\b(finally)\b/; // X ?
throwKeyword = /\b(throw)\b/; // X ?
returnKeyword = /\b(return)\b/; // X ?
ifKeyword = /\b(if)\b/; // X ?
elseKeyword = /\b(else)\b/; // X ?
whileKeyword = /\b(while)\b/; // X ?
doKeyword = /\b(do)\b/; // X ?
forKeyword = /\b(for)\b/; // X ?
inKeyword = /\b(in)\b/; // X ?
switchKeyword = /\b(switch)\b/; // X ?
caseKeyword = /\b(case)\b/; // X ?
defaultKeyword = /\b(default)\b/; // X ?
breakKeyword = /\b(break)\b/; // X ?
continueKeyword = /\b(continue)\b/; // X ?
implementsKeyword = /\b(implements)\b/; // X
interfaceKeyword = /\b(interface)\b/; // X
packageKeyword = /\b(package)\b/; // X
privateKeyword = /\b(private)\b/; // X
protectedKeyword = /\b(protected)\b/; // X
publicKeyword = /\b(public)\b/; // X
staticKeyword = /\b(static)\b/; // X
awaitKeyword = /\b(await)\b/; // X
enumKeyword = /\b(enum)\b/; // X
leftBracket = ""{{"";
rightBracket = ""}}"";
leftParen = ""("";
rightParen = "")"";
leftSquare = ""["";
rightSquare = ""]"";
comma = "","";
dot = ""."";
equals = ""="";
colon = "":"";
semicolon = "";"";
and = ""&&"";
or = ""||"";
not = ""!"";
strictEquality = ""==="";
strictInequality = ""!=="";
equality = ""=="";
inequality = ""!="";
lessThanOrEqual = ""<="";
greaterThanOrEqual = "">="";
lessThan = ""<"";
greaterThan = "">"";
ws = /\s+/;
ident = /\b[$A-Za-z_][$A-Za-z_0-9]*\b/;
number = /\b\d+(?:\.\d+)?\b/;
doubleString = /""(?:\\\\""|\\\\[^""]|[^""\\\\])*""/;
singleString = /'(?:\\\\'|\\\\[^']|[^'\\\\])*'/;
regex = /\/(?:\\\\\/|\\\\|[^\/])+\/[A-Za-z]*/;
lineComment = /\/\/[^{"\r\n"}]*/;
blockComment = /\/\*([^*]|\*[^\/])*\*\//;
minusEquals = ""-="";
plusEquals = ""+="";
timesEquals = ""*="";
divideEquals = ""/="";
modulusEquals = ""%="";
bitAndEquals = ""&="";
bitOrEquals = ""|="";
bitXorEquals = ""^="";
minus = ""-"";
plus = ""+"";
times = ""*"";
divide = ""/"";
modulus = ""%"";
bitAnd = ""&"";
bitOr = ""|"";
bitNot = ""~"";
bitXor = ""^"";
question = ""?"";
basicKeywords = varKeyword | letKeyword | newKeyword | deleteKeyword | instanceofKeyword | withKeyword | voidKeyword | typeofKeyword | thisKeyword | debuggerKeyword | importKeyword | classKeyword | constKeyword | extendsKeyword | yieldKeyword | superKeyword;
functionLevelKeywords = functionKeyword | tryKeyword | catchKeyword | finallyKeyword | throwKeyword | returnKeyword;
controlKeywords = ifKeyword | elseKeyword | whileKeyword | doKeyword | forKeyword | inKeyword | switchKeyword | caseKeyword | defaultKeyword | breakKeyword | continueKeyword;
futureKeywords = implementsKeyword | interfaceKeyword | packageKeyword | privateKeyword | protectedKeyword | publicKeyword | staticKeyword | awaitKeyword | enumKeyword;
validIdent = im !(basicKeywords | functionLevelKeywords | controlKeywords | futureKeywords) ident;
string = doubleString | singleString;
paren = leftParen expr3 rightParen;
unaryOper = minus | plus;
unaryMath = unaryOper *unaryOper expr2;
typeof = typeofKeyword expr2;
block = leftBracket *statement rightBracket;
paramList = leftParen ?(validIdent *(comma validIdent)) rightParen;
namedFunction = functionKeyword validIdent paramList block;
anonFunction = functionKeyword paramList block;
propertyDef = (validIdent | string) colon expr3;
object = leftBracket ?(propertyDef *(comma propertyDef)) rightBracket;
dotRef = dot validIdent;
key = leftSquare expr3 rightSquare;
argList = leftParen ?(expr3 *(comma expr3)) rightParen;
expressionFragment = dotRef | key | argList;
propertyFragments = (expressionFragment propertyFragments) | dotRef | key;
functionCallFragments = (expressionFragment functionCallFragments) | argList;
constructor = newKeyword functionCall;
// == END expr0 DEFINITIONS ==
functionCall = expr0 functionCallFragments;
propertyReference = expr0 propertyFragments;
// == END expr1 definitions ==
mathOper = minus | plus | times | divide;
math = expr1 mathOper expr2;
logicOper = and | or;
logicNegation = not expr2;
logic = expr1 logicOper expr2;
bitOper = bitAnd | bitOr | bitXor;
bitNegation = bitNot expr2;
bitwise = expr1 bitOper expr2;
instanceof = expr1 instanceofKeyword expr3;
in = expr1 inKeyword expr3;
// == END expr2 DEFINITIONS ==
assignOper = equals | minusEquals | plusEquals | timesEquals | divideEquals | modulusEquals | bitAndEquals | bitOrEquals | bitXorEquals;
localAssignment = validIdent assignOper expr3;
propertyAssignment = propertyReference assignOper expr3;
assignment = localAssignment | propertyAssignment;
ternary = expr2 question expr3 colon expr3;
// == END expr3 DEFINITIONS ==
variable = localAssignment | validIdent;
variableDecl = (varKeyword | letKeyword | constKeyword) variable *(comma variable);
break = breakKeyword;
continue = continueKeyword;
return = returnKeyword ?expr3;
throw = throwKeyword ?expr3;
delete = deleteKeyword propertyReference;
catch = catchKeyword block;
finally = finallyKeyword block;
try = tryKeyword block catch *catch ?finally;
default = defaultKeyword colon *statement;
case = caseKeyword (string | number | (validIdent *dotRef)) colon *statement;
switch = switchKeyword leftBracket *case ?default *case rightBracket;
else = elseKeyword statement;
if = ifKeyword statement ?else;
while = whileKeyword paren statement;
doWhile = doKeyword statement whileKeyword paren ?semicolon;
for = forKeyword leftParen ((variableDecl | expr3) semicolon expr3 semicolon expr3) rightParen statement;
expr0 = thisKeyword | anonFunction | validIdent | number | string | paren | unaryMath | logicNegation | bitNegation | constructor | object;
expr1 = functionCall | propertyReference | expr0;
expr2 = math | logic | instanceof | in | bitwise | expr1;
expr3 = ternary | assignment | expr2;
blockStatement = if | while | doWhile | forIn | for | switch | namedFunction | block;
statement = blockStatement | ((variableDecl | break | continue | return | throw | delete | expr3) ?semicolon) | semicolon;
root = statement *statement;
";
var parserGen = new ParserGenerator();
Grammar grammar = parserGen.BuildGrammar(grammarString, "ws", "lineComment", "blockComment");
grammar.AttachAction("root", (branch, recurse) =>
{
ISemanticNode first = recurse(branch.GetDescendant(0));
ISemanticNode[] rest = branch.GetDescendant(1)
.Elements
.Select(recurse)
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.Root, first, rest));
});
grammar.AttachAction("statement", (branch, recurse) =>
{
ISemanticNode stmt = recurse(branch.GetDescendant(0));
return(new BranchSemanticNode((int)JsNodeType.Statement, stmt));
});
grammar.AttachAction("variableDecl", (branch, recurse) =>
{
ISemanticNode first = recurse(branch.GetDescendant(1, 0));
ISemanticNode[] rest = branch.GetDescendant(2)
.Elements
.Select(n => recurse(n.GetDescendant(1, 0)))
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.Variable, first, rest));
});
grammar.AttachAction("localAssignment", (branch, recurse) =>
{
ISemanticNode lvalue = recurse(branch.GetDescendant(0));
ISemanticNode expr2 = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.Assignment, lvalue, expr2));
});
grammar.AttachAction("propertyAssignment", RuleActions.PropertyAssignment);
grammar.AttachAction("propertyReference", RuleActions.CompositeExpression);
grammar.AttachAction("argList", (branch, recurse) =>
{
BranchParseNode args = branch.GetDescendant(1);
if (args.Elements.Count == 0)
{
return(new BranchSemanticNode((int)JsNodeType.ArgumentList, branch.StartIndex, new ISemanticNode[0]));
}
ISemanticNode first = recurse(args.GetDescendant(0));
ISemanticNode[] rest = args
.GetDescendant(1)
.Elements
.Select(n => recurse(n.GetDescendant(1)))
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.ArgumentList, branch.StartIndex, new[] { first }.Concat(rest)));
});
grammar.AttachAction("dotRef", (branch, recurse) =>
{
ISemanticNode ident = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.DotReference, ident));
});
grammar.AttachAction("key", (branch, recurse) =>
{
ISemanticNode key = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.KeyReference, key));
});
grammar.AttachAction("functionCall", RuleActions.FunctionCall);
grammar.AttachAction("constructor", RuleActions.Constructor);
grammar.AttachAction("expressionFragment", RuleActions.Unwrap);
grammar.AttachAction("object", (branch, recurse) =>
{
BranchParseNode firstNode = branch.GetDescendant(1, 0);
if (firstNode == null)
{
return(new BranchSemanticNode((int)JsNodeType.Object, branch.StartIndex, new ISemanticNode[0]));
}
ISemanticNode first = recurse(firstNode);
ISemanticNode[] rest = branch.GetDescendant(1, 1)
.Elements
.Select(n => recurse(n.GetDescendant(1)))
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.Object, branch.StartIndex, first, rest));
});
grammar.AttachAction("propertyDef", (branch, recurse) =>
{
ISemanticNode ident = recurse(branch.GetDescendant(0));
ISemanticNode value = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.PropertyDefinition, ident, value));
});
grammar.AttachAction("anonFunction", (branch, recurse) =>
{
ISemanticNode paramList = recurse(branch.GetDescendant(1));
ISemanticNode body = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.AnonymousFunction, paramList, body));
});
grammar.AttachAction("namedFunction", (branch, recurse) =>
{
ISemanticNode name = recurse(branch.GetDescendant(1));
ISemanticNode paramList = recurse(branch.GetDescendant(2));
ISemanticNode body = recurse(branch.GetDescendant(3));
return(new BranchSemanticNode((int)JsNodeType.NamedFunction, paramList, body));
});
grammar.AttachAction("paramList", (branch, recurse) =>
{
ISemanticNode first = recurse(branch.GetDescendant(1, 0));
ISemanticNode[] rest = branch.GetDescendant(1, 1)
.Elements
.Select(n => recurse(n.GetDescendant(1)))
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.ParameterList, first, rest));
});
grammar.AttachAction("block", (branch, recurse) =>
{
ISemanticNode[] stmts = branch.GetDescendant(1)
.Elements
.Select(recurse)
.ToArray();
return(new BranchSemanticNode((int)JsNodeType.Block, branch.StartIndex, stmts));
});
grammar.AttachAction("bitwise", (branch, recurse) =>
{
ISemanticNode left = recurse(branch.GetDescendant(0));
ISemanticNode right = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.Bitwise, left, right));
});
grammar.AttachAction("bitNegation", (branch, recurse) =>
{
ISemanticNode operand = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.BitwiseNegation, operand));
});
grammar.AttachAction("logic", (branch, recurse) =>
{
ISemanticNode left = recurse(branch.GetDescendant(0));
ISemanticNode right = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.Logic, left, right));
});
grammar.AttachAction("logicNegation", (branch, recurse) =>
{
ISemanticNode operand = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.LogicNegation, operand));
});
grammar.AttachAction("math", (branch, recurse) =>
{
ISemanticNode left = recurse(branch.GetDescendant(0));
ISemanticNode right = recurse(branch.GetDescendant(2));
return(new BranchSemanticNode((int)JsNodeType.Math, left, right));
});
grammar.AttachAction("unaryMath", (branch, recurse) =>
{
ISemanticNode operand = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.UnaryMath, operand));
});
grammar.AttachAction("paren", (branch, recurse) =>
{
ISemanticNode operand = recurse(branch.GetDescendant(1));
return(new BranchSemanticNode((int)JsNodeType.Parenthetical, operand));
});
grammar.AttachAction("validIdent", (branch, recurse) =>
{
branch = branch.GetDescendant(1);
var ident = branch.Leaf.MatchedText;
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)JsNodeType.Identifier, startIndex, ident));
});
grammar.AttachAction("doubleString", (branch, recurse) =>
{
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\""", @"""");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)JsNodeType.String, startIndex, text));
});
grammar.AttachAction("singleString", (branch, recurse) =>
{
var text = branch.Leaf.MatchedText;
text = text
.Substring(1, text.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\'", @"'");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)JsNodeType.String, startIndex, text));
});
grammar.AttachAction("string", RuleActions.Unwrap);
grammar.AttachAction("regex", (branch, recurse) =>
{
var pattern = branch.Leaf.MatchedText;
pattern = pattern
.Substring(1, pattern.Length - 2)
.Replace(@"\\", @"\")
.Replace(@"\/", @"/");
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)JsNodeType.RegularExpression, startIndex, pattern));
});
grammar.AttachAction("number", (branch, recurse) =>
{
var number = branch.Leaf.MatchedText;
var startIndex = branch.Leaf.StartIndex;
return(new LeafSemanticNode((int)JsNodeType.Number, startIndex, number));
});
grammar.AttachAction("expr0", RuleActions.Unwrap);
grammar.AttachAction("expr1", RuleActions.Unwrap);
grammar.AttachAction("expr2", RuleActions.Unwrap);
grammar.AttachAction("expr3", RuleActions.Unwrap);
grammar.AttachAction("assignment", RuleActions.Unwrap);
return(grammar);
}
internal static ISemanticNode Whitespace(BranchParseNode node, Func <BranchParseNode, ISemanticNode> recurse)
{
return(null);
}